WARNING: The following contains spoilers for Season 3, Episode 7, of Westworld, "Passed Pawn," which aired Sunday on HBO.

The Season 3 premiere of Westworld introduced us to a new human character named Caleb Nichols. Like all humans under Rehoboam's control, Cal was going through his own loop. He was a military veteran now working construction, he visited his ailing mother in the hospital and he continuously tried to get a better job. Almost as soon as he was introduced, it was clear Cal was more than he appeared to be. The plot only thickened when his mother, who suffers from dementia, said she didn't recognize him as her son. Of course, this could be a symptom of her disease -- but in a series like Westworld, it made viewers wonder if Cal wasn't Cal at all.

Now, thanks to the series' latest episode, "Passed Pawn," we finally know who Cal really is. Although it's not clearly stated, it perfectly explains why his mother couldn't recognize him.

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The first two seasons of Westworld taught viewers to question everything they think they know. Characters thought to be humans were revealed to be hosts, and events which appeared to unfold in a linear manner could take place in different times -- be that the past or the future. Therefore, since the series conditioned viewers to be suspicious, Cal not getting recognized by his mother instantly raised a red flag. Perhaps she didn't recognize him because he had been replaced by a host, and the woman's dementia allowed her to see through the facade. The theory was only cemented in a subsequent episode, when Cal once again visited his mother, only for her to tell him again he wasn't her son.

Aaron Paul in Westworld Season 3

As it turns out, it wasn't because Cal was a host. In "Passed Pawn," we learn that Caleb is indeed human. However, his memories of his past were altered in a reconditioning center. Cal was actually a soldier, as he remembered, but after getting discharged, he became an unknowing agent of Solomon, tracking and kidnapping outliers through the Rico app. When he learned the truth about what he was really doing, he was sent to a facility to be reconditioned.

After this, Cal was given a new life -- one where he didn't remember his time as an agent of Solomon, and where parts of his life had now been altered. Therefore, it seems likely that the woman Cal believes to be his mother isn't his mother at all. He was simply conditioned to believe this woman is his mother, while a woman with dementia was placed in his life by the system to keep him in line.

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The most logical explanation is that she was, in fact, telling the truth: Cal is not her son -- because she isn't his mother at all. Given her medical condition, no one, not even her "son," would be inclined to believe her. It was truly a devious move on the machine's part.

Following the conclusion of the episode, it's unclear if Cal has realized this or not. However, if he learns that his mother isn't his mother at all in the season finale, this could prove to be a revelation that changes everything for the character.

Airing Sundays at 9 p.m. ET/PT on HBO, Westworld stars returning cast members Evan Rachel Wood, Thandie Newton, Ed Harris, Jeffrey Wright, Tessa Thompson, Luke Hemsworth, Simon Quarterman and Rodrigo Santoro, joined by series newcomers Aaron Paul, Vincent Cassel, Lena Waithe, Scott Mescudi, Marshawn Lynch, John Gallagher Jr., Michael Ealy and Tommy Flanagan.

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